Kim Kardashian thanks doctors after son's pneumonia

Kardashian West with husband Kanye West and their children, North and Saint. Photo: Kim Kardashian West/Instagram

Kim Kardashian has thanked doctors and nurses after her son was hospitalised for three nights following a pneumonia diagnosis.

In two tweets on Wednesday morning, Kardashian, 37, revealed two-year-old Saint West suffered from a bout of the illness towards the end of December.

"My precious baby boy is so strong!" Kardashian wrote. "After spending three nights in the hospital & seeing my baby get multiple IV's [sic] and hooked up to oxygen machines, our end of year was challenging. Pneumonia is so scary."

Pneumonia is a lung infection which results in inflammation of the lungs' air sacs. Symptoms include flu-like symptoms, as well as having trouble breathing and chest pain.

The reality star and businesswoman went on to say she was "so grateful" for "every nurse [and] doctor out there who works so hard around the clock", adding that her son was now "home and all better".

"He's so resilient I'm sure he will still say the ambulance ride was cool! My strong Saint."

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Kardashian and husband, rapper Kanye West, have two children: Saint and his older sister, four-year-old North.